Some of the NFL's biggest names aren't in ideal situations, and it might be time for a 2021 change of scenery.

Expiring contracts play a major factor, but so do situations in which the players aren't matching previous production. A current or future positional battle could also play a role, whether it's competing with younger players or waiting for their team to draft a replacement.

A number of big names fall under this umbrella. Let's take a look at a few of them.

A.J. Green, WR, Cincinnati Bengals

After nine-plus seasons with the Cincinnati Bengals, A.J. Green needs a new home.

He missed the 2019 campaign because of a severe ankle injury, but the Bengals retained the star receiver last offseason via the franchise tag. That gave them time to evaluate how Green would fare with rookie quarterback Joe Burrow before deciding if they wanted to offer the 32-year-old a contract extension.

Unfortunately for them, Green hasn't had much of an impact. Through eight games, he's caught just 31 passes for 316 yards and zero touchdowns, struggling to carve out a bigger role. Meanwhile, young receivers Tyler Boyd, 25, and rookie Tee Higgins, 21, are getting comfortable with Burrow and overshadowing the seven-time Pro Bowler.

As an unrestricted free agent in 2021, Green could leave the only franchise he's ever known. He may not get the money he's looking for, considering his age and injury history, but Green should still have a number of teams calling, given his track record.

A team like the New England Patriots, who desperately need more reliable talent at wide receiver, could make a lot of sense for Green. Young players like N'Keal Harry, 22, and Jakobi Meyers, 24, could learn a lot from Green while still allowing the veteran to get his fair share of touches.

Best Fit: New England Patriots

Anthony Harris, S, Minnesota Vikings

The Minnesota Vikings will have some tough decisions to make this offseason, including what to do with safety Anthony Harris.

Harris has come a long way since going undrafted in 2015, establishing himself as a starter alongside Harrison Smith. He had a career year in 2019, snagging a personal-best six interceptions, which was tied for the most in the NFL. 

That was enough for Harris to earn another year with the Vikings under the franchise tag. However, NFL Network's Ian Rapoport reported in March that Minnesota had considered trading the safety after tagging him.

He has done little to solidify his future in Minnesota this season. The 29-year-old has yet to register an interception through eight games, while opposing quarterbacks have posted a concerning 133.2 passer rating when throwing his way. 

It's unlikely the Vikings will be willing to re-sign Harris to a sizable extension given his drop-off in play. That won't stop a team like the Dallas Cowboys, however. They need help in their secondary, and a bet on Harris' returning to peak levels could give the defense a much-needed lift in 2021.

The Cowboys still need to figure out if they'll re-sign quarterback Dak Prescott. If they do and enough of their projected $34 million in cap space is left over, it would be smart to make a run at Harris.

Best Fit: Dallas Cowboys

Allen Robinson II, WR, Chicago Bears

As one of the NFL's more talented wide receivers, Allen Robinson II has spent the first six-plus seasons of his career without an elite quarterback throwing him the ball. The Chicago Bears star could have an opportunity to change that this offseason.

Robinson will be an unrestricted free agent after 2020, but talks regarding a potential extension stalled as of early October, per CBS Sports' Jason La Canfora. Even some of Robinson's teammates took to Twitter to pressure the team to extend the 27-year-old. 

Robinson continues to play at a high level regardless of who is playing under center. Through nine games, he has caught 57 passes for 712 yards and three touchdowns.

If the Bears and Robinson can't agree on a long-term deal, then there will be a lot of interest around the league for the one-time Pro Bowler. He's on pace for his second straight season with at least 1,000 yards despite playing in an offense that ranks 29th in total yards, which speaks volumes about Robinson's playmaking ability.

A team with a high-powered offense and a need at wide receiver could make a strong offer. The Texans might be in the market for a new weapon for Deshaun Watson after trading DeAndre Hopkins and potentially losing Will Fuller V to free agency.

A lack of early draft picks could also make signing a No. 1 receiver a top priority for Houston. Although the Texans are projected to be $12 million over the cap next season, whoever takes over as the new GM will likely want to clean house and offload as many overpriced contracts as possible.

Robinson's price tag might be high, but if the Texans can clear enough cap space, they could make finding a No. 1 receiver one of their top priorities.

Best Fit: Houston Texans